Mechanical shovel



Oct. 20, 1931. R. M. BAKER MECHANICAL SHOVEL Filed April 5, 1930 awe/141 010 Patented Oct. 2%, 1931 Mme Y ROY M. BAKER, 0F CHISHQIM, MINNESOTA Application filed April 5, 19530. S c rial Nlo. 441,8;4.

This invention relates to mechanical shovels such as used for tunnelling purposes, underground mining, or the like, the principal objects of which are simplicity and practicability.

Another object is to produce a shovel of this type requiring the minimum movement of the shovel proper to accomplish. loading or unloading thereof.

Another object is to provide novel and simple means for obtaining clearance from the ground during transportation of the shovel when either loaded or light.

Another object is to provide simple means whereby the digging thrust is applied as directly as possible from the power element to the lower digging edge of the shovel.

Still other objects and advantages of the invention will appear in the following de scription thereof.

Referring now to the accompanying drawings, forming part of this application, and wherein like reference characters indicate like parts Figure 1 is a top plan view of one of the improved shovels as applied to the forward end of a caterpillar tractor, and

Figure 2 is a central vertical section of Figure 1 showing portions of the device in elevation.

1 represents the forward end of any de sired form of tractor preferably of the caterpillar type which is adapted for such use and to which I have illustrated my shovel as being attached by means of the bracket 2. This latter bracket may be of any desired 7 with side flanges 5 at the uppermost corners thereof.

To the face of the apron 4 and centrally thereof is attached as by the bolts 6 the U- shap-ed metal yoke 7 provided with the horizontally projecting spaced arms 8 one at either extremity of the yoke and which arms carry at their outermost ends the pins or gudgeons-Q upon which the rotatable shovel or scoop is mounted.

This scoop comprises the bottom member or'lip 10, side members 11, and heel 12. The lip and heel areof one continuous piece 55 forming the bottom of the shovel, but the latter is arcuate in shape and-extends upwardly a considerable distance from the plane ofthe bottom and forms part of'a true cylinder withthe rearmo'st portions of the H side members '11. lShe-bottom memberincreases in thickness towards the rear thereof forming the shoulder 13, and 'wliiclifis so designed that when the shovel is'in itsinost favorable position for digging it willa-but H the'lower edge of the central member 3 of I the bracket 2 forming an adequate stop or bumper for the lowermost action of the shovel, and .it will be noted that therearedge ofthe heel 12 of the bottomof the shovel O is so terminated as to simultaneously bump or engage the lower edge of the yoke-Tforming a'fd'ouble retarding means. It will be noted "also that this double engagement or bumper for the shovel acts asa'nadequate thrusting element when the shovel is driven to its work by theforwardthrust of the tractor, thus applying such thrust directly tojthe bottom member of the shovel. l

urtliermore when desirable to operate the shovel against a dump or wall of material to be usedat an angleor with the'lippointed upwardly somewhat, the same may be readily accomplished by the gudgeons 9 taking the thrust .with the bumper eleinents jus't "d e sc1-ibecli1on;engaged. However in this event the "upturned or arcuately shaped heel becomes advantageous' in preventing any inavterial falling overthe heel of the shovel as the apt-e114 is made to depend materially .99 below the terminal edge ofthe heelas clearly seen in Figure 2 of the drawings. 7

I ameans for rotatingjthe shovel I have provided the sheave fixed toeither inner face of the sidewalls 11 and centered upon the ,gue e n's l9, they being intermediate of the walls of the shovel andthe arms 8 of the yoke. A line 15 isr oven about each shea'vetheiendsbeingffined as at 1,6 thereto fi emen-smelly 'ind ed v ly through suitable holes in the apron to the one direction, and means whereby movement drums 17 for the manipulation of same and of the shovel in the other direction will dump which drums may be operated and controlled same. in any desired manner well known in the art. In testimony whereof I afiix my s1 ature. 6 The shovel being thus mounted upon the ROY M. BA ER. 70

gudgeans will normally tend to rock and feed itself downwardly until the bumper members are engaged when the limit of such downward action is prevented, and in order to clear the ground when the tractor has ac- 1 76 complished the load of the shovel all that is necessary is to apply draft to the lines suflicient to raise the shovel until its bottom is in horizontal position as in Figure 2, 1 when ample clearance is provided for such 80 transportation. Then when unloading the process is certainly reduced to extreme simplicity in that a continuation of the draft on the lines will cause the shovel to assume 2 the position shown in dotted lines at 18, Figure 2, when the contents will fall vertically intermediate of the extreme edge of the heel and the lower edge of the apron 4 and in fact the shovel may readily be transported when 25 light in such position, to economize in space,

etc.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is: 30 1. A mechanical shovel comprising a bracket, a rotatable shovel mounted upon said bracket, an upstanding apron fixed to said bracket, and means for rotating the shovel, the apron limiting its rotation in one direc- 35 tion and the bottom of the bracket limiting its rotation in the other direcion.

,2. In a rotar shovel, a chassis frame, a bracket mounte upon the forward end of the chassis frame, an apron-like structure carried 40 by the bracket extending both above and be- 1 neath the frame, a yoke fixed to the bracket and having bracket like extensions upon either side thereof in which the shovel is journalled, and means for rotating the shovel for 45 the purpose described.

3. A support for a rotary shovel compris, ing a U-shaped bracket, shovel supporting trunnions in the free ends of the bracket, a T shovel upon said trunnions externally of the 60 bracket, and means whereby the shovel is dumped beneath the axis thereof by extreme elevation of the forward end of the shovel.

4. A rotary shovel comprisin a support- 1 ing frame, a bracket fixed to the Iorward end 5 of the frame, an apron extending above and below the bracket and fixed thereto, a shovel mounted upon said bracket, and the apron forming a continuation of the bottom of the shovel when in digging position. 60 5. A rotarv shovel comprising a supporting frame, a bracket fixed to the forward end of the frame, a shovel pivotally mounted in said bracket, an apron forming a continuation of the bottom of the shovel when in dig- 65 ging position, and limiting its movement in 

